I think it is not acceptable even if you aren´t married and you have a girlfriend, because you should respect your wife or girlfriend, If you don´t love her, why do you stay with her?, if you love her, Why do you flirt whit a person who isn´t your wife or girlfriend? I think that if you flirt with another person is because of you want something from this person.

In my opinion,it is unfair to your spouse,you select one person to live togeter with you,it means that you lost the right to live with others , everyone should loyal to your love and loyal to your lover,if you do not love your spouse again,you can tell her/him,and you can separate with her/him,then you can flirt with others,i hear many stores that one person get togeter with two or more people which lead to tragedy,i wish everyone will enjoy your happiness with your lover